A corpora



w. E. STANDLEY. WINDOW GLASS BLOWING HEAD.

APPLICATION FILED NOV. 17. I915.

Patented June 24, 1919 INVENTOR dow' glass consists of a hollow drawinghead mounted to move vertically and connected STATES PATENT ora or.

WILLIAM E. SIANDLEY, or m'mssuaen, rennsnvama, Assreaoa ro wmnow GLASS.ROTARY- ro'r comrm, non orrmsrtvam OF PITTSBURGH, PENNSYLVANIA,

I wmnow-eLAss-BLowrnG HEAD.

To all whom) it mag "concern;- a Be it known that'IQ'lYrnLmii E. STAND-LEY; a resident of Pittsburgh; in the county of Allegheny and' State ofPennsylvania, have invented a new and useful'lmprovement inWindow-Glass-Blowing Heads, of which the .following is a specification;

This invention relates to window glass blowing heads.

'One common machine 'for making winbodnnent of the invention, F igure- 1is in part a side. elevation and in part a'sectio'nalto a conduitforsupplying air'thereto; Said glass and is then elevated at; a uniform-head, at its lower end, carries what is known as a bait, which isdipped into the molten clings to the bait so that a hollow glasscylinder is pulled up therebyas the head is ele- 'V&ll8d, the airpressure expanding said-cyb- Y but and from any remainin 'so 7 1 theuniformity of the upward-travel of .the bait an the air presinder to adiameter larger thanthatof the bait. By, carefully ad ustin the rate ofsure therein. a glass cylinder is drawn of any desired size and is'theneut'ofi from the molten glass in the pot, slitted longitudina lyandopened out flat to form a sheet. j'The quality and thickness of theglass do end entirely upon rawing operation, either in the rate ofupward since variations travel of the bait or in the air pressurewithlated mor readily and efliciently than the form in said hollowcylinder produces wavy glass or a'cylinder of non-uniform diameter orthickness, and consequently an uneven or 11'- regular surface on thefinal sheet. The object of this invention is to provide an improvedglass drawing head which is of simple construction and can bemanipuus'ual forms of such headsi and one which enables the flow -of airtoand from the hol- 10w bait to be regulated to maintain a unipressurewithin the hollow cylinder and 'w ich avoids pulsations inthe aircurrent and the production of a. wavy or otherwise uneven cylinder.-Further objectsof the invention are to provide animproved device ffor,regulating the escape of the excess air in a manner. to avoid conflictof said air with the incoming stream, and-in which. the air is allowedto escape from the cyl1n-. do! closely adjacentto the hollow bait and- 4is a cross Fig. 3. r

" The window glass blowing head shown in therefore before it has flowedupwardly be-' elevation, illustrating the blowing head and the'lower endof the conduit to which it is attached; Fig. '2 'isa plan view thereof;'Fig. 3 is a side elevation from the rightin Fig. 1', and partly brokenoutand in section through theregulating, valve ring; and, Fig. sectionalview on the line 1 4,

the drawings comprises a pipe or conduit 1. which, as'is usual, isdetachably connected to the lower end of avertically travelingtelescoping. air supply pipe (not shown),

and through which air under pressure is supplied for expand ng the glasscylinder.

- This conduit 1 also forms the support for the hollow bait 2, which isa massive metal member having -a hollow boss 3 threaded upon thelowerend of the pipe 1, and a. downwardly flaring upper wall 4diverging.

- Patented June 2.4, 1919.

new filed November 17, 1915. Seria1No .'6 1,974.

described and with-opportunity to cool and at a wide angle andwhose-periphery isunited or in one piece with the downwardly andinwardly extending curved flange or ledge surrounding a central wideopening .6. The curved flangeor ledge 5 is'.intro duced into the moltenglass in the pot'whi'ch flows into the cavity or chamber 7 within thebait 4, and adheres to the flange 5, so as to attach the glass cylinderto the bait and enable it to be lifted from the pot.

through the opening 6 part waya Experience has shown that the air supplyto the hollow bait must he in excess of that required to till theincreasing volume within the cylinderjheing formed, so us-to maintain.

pressure therein and therefore expand Slllh cylinder and allow'cxpanslon of the air byioo the heat of the molten glass'.- A uniformpressure is maintained by providing a relief-oP'vent. from the hollowbait through which a portion of the air is allowed to es- ].pe to theatmosphere, the relief openings 65 that the.

usually being at or near the upper end of the conduit 1, whichnecessitates the simul-' taneous downward travel of the cold .air andthe "upward travel' of the hot air 5 through said-pipe, the conflictingstreams commonly producing a. pul-ating effect and wavy glass cylinders.In my improved drawin head-the excess air is vented at or neariiielow'er end of the conduit 1, so that all of the'air in said conduittravels downwardlyand conflicting streams and the resultant pulsatingelfcct are avoided' Preferably the airis vented below the lower end ofthcpipe 1, for example, through ports or openings 8 in the upper wall ofthe bait, just below the lower end of the pipe 1. These: ports, tour ofwhich are shown for pur-poses ot illustration, communicate with anannular chamber 9 in a hollow casing 10 surrounding the lower end of thepipe 1, and which casing is illustrated as threaded to an annularshoulder of the'bait 2 and pipe 1 by a packing l1 compressedby a gland12 which may be adjusted to tighten the packing in any suitable manner,asby several nuts 13 on bolts lat threaded into the. upper end of thecasing 10. Said casing is also provided with a. non-circular portion'15forming a wrench hold for attaching it to and removing it from tic bait.The air ventedto chamber 9 is allowed to escape therefrom throughseveral ports or openings 16, preferably so arranged as to enable theflow to be regulated so as to compensate for variations in pressure andtemperature and maintain a substantially uniform pressure within thehollow glass .eylinder. As shown, the several ports 16 extend radiallythrough the outer wall of the. casing 10, around which is a regulatingvalve.

. ring 17 provided with several sets of ports.

one set for each of the ports 16. form shown the ring 17 is providedadjacent each of the ports 16 with a large port l.) of the same area asthe port 16, and a port 20 ofsmaller area. It is also prorided with as'uitable operating handle. shown as a rod 1121, eigtending outwardlyand provided with afinger hold Said handleworks be,- tween the. upwardlyextending arms 23 or a stop plate 24 attached to the bait. 2. in oneposition of the handle 21,. when it contacts withame said arms the largeports,,19 ;registeruvith the ports 16. so that *a maximiunflow oi airfrom the hollow bait. isi permittred, while in the other position.

of said arnr, when .it rests against the other arm 23, the. smallerports 20 register with the port-1' 3, and a smaller reliet' efleet'isproduced. By slight"adjustments of the ring 17 away from the twopositions ust described only partial ports 19 and 20 with port 16 iseffected. so

relietcan be cut down to any desealed around the f lVhat I claim is Inthe registration of the sired amountQ The-intermediate position which noair whatever is allowed to escape from the hollow cylinder.

The glass blowing head described is of simple construction and collectsall of the air relief devices at the lower end of the conduit 1. whichnot only holds the heat and prevents too sudden cooling of the glass andenables the regulating valve mechanism to be operated conveniently, butalso does away entirely \ifltltCUl fl t-ting air currents in the pipe 1,and the {ore avoids pulsating effects and the production of a wavy glasscylinder. the-pressure of the air'supply to the conduit 1 and the rateof upward movement. of saidpipe the glass cylinder may be expanded toany"-(liaim-ter and can be drawn to any lengthwvitliin the capacityotthe pot. It has a uniform diameter from end to end and produces a flatsl'ieet practically free of i 'npertections and of better quality thanwith the usual forms of apparatus.

1. A glass blowing. head, comprising a hollow bait tor engaging molten gass, a

conduit for compressed air communicating with the chamber in said bait,said bait .being provided with aseries of openings through itswallilltllllltllllt'. conduit opening to permit the escape of air, a casing'inelosing a chamber-on the outerface of said bait and with which saidperforations ('(nnnulnicale, the wall. of said casing being providedwith. an opening,'and a ring inounted on the outside of said casingadapted to ,lnrn thereon and havingperforations oi. dili'erent sizesadapted. to register; alternately with theopening through the wall ofsaid casing to regulate the escape of air from said bait.

2. A glass blowing head,fconiprising a hollow bait. having an inturnedflange for engaging molten glass. 11., Source of com- By properlymanipulating pressed air communicating with the chamber in saidbait,.the outer wall of said bait being providedwith a series ofperforations to permit. the escape. of air, a casing on the 'onlefi"sideof said bait inclosing'a chamber with which said perfortionseoimnunicate, a ring rotatably mounted:on thefoutside of said casing,said ring and the wall of said easinghaving perforations of differentsizes adapted to be brought into register alternately, and'lneans tomanually adjust the position of said ring to'control the amount of airescaping from'the' interior of said bait. I i

3. A' glass blowing bait adapted to engage molten'glass and inclosing acliam.l i e.i, a compressed air conduit eonm cted centrally to andcarrying said bait,perforathms'through the walls of said bait aroundsaid conduit. an annular chamber on the outer face of said bait withwhich saidoperforations comnmnicate, and a ring rotutnbly mounted on theoutside-0f the bait, said ring and the wall of said annular chamberhaving perforations of different sizes adapted to be bronght into mg Iister alternately; said ring being manually adjusted to bring theperforations of dif-

